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From: Steve Nickolas <usotsuki@buric.co>
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Subject: Re: [TUHS] reviving a bit of WWB
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On Sun, 20 Sep 2020, Warner Losh wrote:

> 0 is fine if sizeof(int) == sizeof(void *). Otherwise varadic function
> calls break.

I've never written anything that uses varargs, so I've never run into 
that.  But I've actually done quite a bit of work with an environment 
where this isn't true: MS-DOS using the large or huge model.  In this 
environment, sizeof(int)=2, and sizeof(void*) is 4.

-uso.